Sharing over a decade of architecture experience from Baidu, Alibaba, and Tencent.
This article explains the Java Adapter design pattern, covering its definition, roles (Target, Adapter, Adaptee), and two implementation approaches—class adapter using inheritance and object adapter using composition—with complete code examples for each.
This article provides a comprehensive explanation of the Java Decorator pattern, covering its definition, purpose, advantages, disadvantages, and a complete implementation example with four key roles and runnable code demonstrating dynamic behavior extension.
This comprehensive guide details nine essential MySQL DBA commands — SHOW DATABASES, SHOW TABLE STATUS, SHOW FULL PROCESSLIST, SHOW ENGINE INNODB STATUS, SHOW VARIABLES, SHOW STATUS, EXPLAIN, SHOW INDEX, and SHOW CREATE TABLE — with syntax examples, key output fields, and practical troubleshooting scenarios for performance tuning and database administration.
This guide covers 10 essential Elasticsearch command categories with practical examples, including cluster health checks, index management, CRUD operations, mapping design, and node/shard monitoring for production troubleshooting.
This comprehensive guide covers nine essential ElasticSearch query types including match_all, term, terms, range, prefix, wildcard, regexp, bool compound queries, and fuzzy queries, with practical code examples for each method.
This article provides a comprehensive explanation of Java's six thread states—New, Runnable, Blocked, Waiting, Timed Waiting, and Terminated—with visual diagrams illustrating each state's transitions and typical triggers such as lock acquisition, wait/notify, and timeout mechanisms.
This article details six essential Nginx configuration optimizations for high-concurrency scenarios, covering worker processes, connection limits, epoll event model, TCP reuse via sendfile and TCP options, HTTP keepalive, and upstream connection pooling with concrete examples and configuration snippets.
This guide walks through the essential Kafka command‑line tools for creating, listing, describing, and altering topics, producing and consuming messages, and managing consumer groups, providing concrete examples and key parameters for each operation.
This article walks through essential Nginx command‑line tools—including version checks, configuration testing, graceful and fast shutdowns, reloads, log reopening, and specifying custom configuration files—showing concrete examples and explaining when each command should be used in development and production environments.
The article presents a four‑layer method for diagnosing sudden Redis memory growth, covering recent releases or configuration changes, key monitoring metrics, sampled key analysis, and emergency mitigation steps, with concrete metric definitions and practical examples.
